damp course

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Noun1.damp course - a course of some impermeable material laid in the foundation walls of building near the ground to prevent dampness from rising into the building
row, course - (construction) a layer of masonry; "a course of bricks"
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Peter Cox installed a new dampproof course using a silicone-based cream, which lines the capillaries of the structure, creating a barrier to prevent further rising damp, while allowing the walls to dry out.
If you want to keep the rustic brick look, you could tank the wall on the outside and slot in a dampproof course to keep damp out.
What happens in properties is people get landscaping or paving laid over the existing ground, raising it above the dampproof course barrier, so just check your ground levels.
It recommended improvements to cavity wall insulation and the dampproof course.
It could be that your dampproof course - a horizontal barrier within the wall designed to stop moisture rising - has failed.
Groundwork up to the dampproof course was marked with a bricklaying ceremony by Birmingham City Councillor Len Clark, who is a trustee.
Soil heaped over a dampproof course can also cause damp,as can defective pointing.